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Predicting Signal Degradation in Submarine Communication Cables

February 25, 2020 By admin Leave a Comment

Researchers analyze signals from subsea experiments to determine the performance of submarine communication cables with optimum efficiency.

Lying on the seabed is an interconnected system of submarine communication cables carrying signals for such ubiquitous modern technologies as the internet. Spanning the vastness of oceans, these cables allow for telecommunications between continents. Though difficult, the ability to predict and measure cable performance is necessary for efficiently upgrading the system.

Jean-Christophe Antona leads a group of researchers at Alcatel Submarine Networks, France, that propose a quality of transmission estimator for the design, upgrade and interconnection of submarine cables. Antona will present the group’s performance estimator at the Optical Fiber Communication Conference and Exhibition (OFC), to be held 8-12 March 2020 at the San Diego Convention Center, California, U.S.A.

“Speed is key when you design a submarine system, because you need to optimize a myriad of parameters related to physics, cost, deployment and material constraints,” Antona said.

To determine how to best optimize these systems, the researchers performed transmission studies to measure how the effective noise varies with a number of different parameters, such as signal power. Aside from the expected signals, they found an additional source of noise previous models have overlooked, which scales proportionally with distance and accounts for up to 10% of the total noise along a line. The characteristics of the noise appear in agreement with recent spectral analyses of guided acoustic wave Brillouin scattering.

They observed this using the generalized droop model, a method for determining the total droop impact of different noise sources developed and validated by the group. According to this model, the overall droop from a cascade of noise sources is a product of the individual droops.

“A consequence is that the optical signal-to-noise ratio (OSNR) degrades faster and faster as distance increases,” said Antona. “This phenomenon is all the more important if the distance is long or the signal-to-noise ratio is low, as in typical submarine space-division multiplexing.”

“From this simple rule, the OSNR can be accurately modeled from the knowledge of individual OSNR degradations caused by independent sources of noise,” he said. “With such an approach, we can therefore use simple, available models to estimate the OSNR terms associated with each propagation effect independently, then combine them using the generalized droop model.”

This method reduces the problem from a complex, time-consuming process down to simple multiplication.

With the generalized droop model, the group was able to estimate independent contributions to OSNR and use them to accurately predict transceiver performances for over 100 subsea experiments of a typical submarine fiber with distances ranging from 1,522 to 16,203 kilometers.

These results and additional research will be presented onsite at OFC 2020.

Hear from the Research Team

“Analysis of 34 to 101GBaud submarine transmissions and performance prediction models,” J.-C. Antona, A. C. Meseguer, S. Dupont, R. Garuz, P. PLantady, A. Calsat and V. Letellier, Tuesday, 10 March 2020, Room 7, 5:15 p.m. PDT

Registration Information

Register before 10 February 2020 and save on a full technical conference pass. Credentialed media and analysts who wish to cover OFC 2020 can find registration and other essential information in the OFC media room.

About OFC
The Optical Fiber Communication Conference and Exhibition (OFC) is the largest global conference and exhibition for optical communications and networking professionals. For more than 40 years, OFC has drawn attendees from all corners of the globe to meet and greet, teach and learn, make connections and move business forward. OFC includes dynamic business programming, an exhibition of more than 700 companies, and high impact peer-reviewed research that, combined, showcase the trends and pulse of the entire optical networking and communications industry. OFC is managed by The Optical Society (OSA) and co-sponsored by OSA, the IEEE Communications Society (IEEE/ComSoc), and the IEEE Photonics Society. OFC 2020 will be held from 8 – 12 March 2020 at the San Diego Convention Center, California, USA. Follow @OFCConference, learn more at OFC Community LinkedIn, and watch highlights on OFC YouTube.

About The Optical Society
Founded in 1916, The Optical Society (OSA) is the leading professional organization for scientists, engineers, students and business leaders who fuel discoveries, shape real-life applications and accelerate achievements in the science of light. Through world-renowned publications, meetings and membership initiatives, OSA provides quality research, inspired interactions and dedicated resources for its extensive global network of optics and photonics experts. For more information, visit osa.org.

Filed Under: Tech Tagged With: Signal Degradation, Submarine Communication Cables

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